code: def scatter_add_real(x, idx, m):
      y = _scatter_add(x, idx, m)
  
      def scatter_add_backward(dy):
          return tf.gather(dy, idx)
  
      return y, scatter_add_backward
  
imports: import numpy
  import tensorflow
  from ..._sparse_ops import _bwd_segment_cmp, _csrmask, _csrmm, _csrsum, _gsddmm, _gspmm, _scatter_add, _segment_reduce
  from ...base import ALL, is_all
  from ...heterograph_index import create_unitgraph_from_csr
  from .tensor import asnumpy, context, copy_to, tensor, zerocopy_from_numpy
label_desc: Use image node_id 16 for calling a global function with example usage: scatter_add_real(x, idx, m) and returns: y,  scatter_add_backward, tf